we have a blog in a sub-directory of the main url. http://www.domain.com/blog/
the blog is run by wordpress and we are using Google Sitemap Generator to create the XML file.
We have an index of all of our sitemaps in the main sitemap.xml which leads to many sitemaps.
From an SEO standpoint would it be best to link directly to the sitemap that is under the blog directory: e.g. http://www.domian.com/blog/sitemap.xml
or should be do a cron (daily) to copy the file to the main domain's directory: e.g. http://www.domain.com/sitemap_blog.xml
which will be linked from the main index with the other sitemaps.
What is the best way from an SEO standpoint???